Kinematic effects of the velocity fluctuations for dark halos population in LCDM model

Abstract

$\Lambda$CDM-model predicts an excess of dark halos compared to the observations. The excess is seen from the estimates of the virialized mass inside the Local Supercluster and its surroundings. It is shown that account for cosmological velocity fluctuations in the process of formation of the population of dark halos it is possible to eliminate this contradiction remaining within the framework of the $\Lambda$CDM cosmology. Based on the formalism of Press and Schechter, we suggest a model of formation of dark halo population which takes into account the kinematic effects in the dark matter. The model allows a quantitative explanation for the observable deficit of the virialized mass in the local Universe.

arXiv comment7 figures; to appear in Astronomy Reports (Apr. 2015)

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